2000 Tacoma heating problem

I have a 2000 Tacoma and I'm having problems getting heat out of it. I reaplaced the thermostat and changed the coolant. Still no change. I disconnected the cable to the heater switch on the firewall and opened it wide open by hand, still no change. Any help or insight into possible problems or solutions would be greatly appreciated...

Thanks

Dale
i have same issue with heater when i turn temp dial to heat i can hear the fan but no heat comes out but if i turn to cooler range air starts to blow fine but is not hot and it does not matter what setting is (defrost, dash, or feet setting)

Are bot heater hoses going thru the firewall as hot as the radiator hoses? Let me know the answers to those 2 questions.Where does the temperature gauge read?
Are bot heater hoses going thru the firewall as hot as the radiator hoses? Let me know the answers to those 2 questions.

6 Suggested Answers

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I'm glad I could help. I'm reposting the solution below in case anyone needs it in the future. Please be sure to rate it for me!

Pull the temperature knob off and verify the thin 12mm nut is installed
and tight behind it. I have seen several of these loosen up allowing
the knob to turn but intermittently have no effect on temperature.

When was last flush and thermostat replaced? Also, it may sound crazy but, when I have a partially clogged heater core, which I suspect you do, I usually will disconnect the hose at the heater core, and connect a drill operated pump from hardware store (about $10) to the heater core, and circulate C.L.R through it before putting it all back together. I usually set it up to pump through the core and back into a pail or similar, and then reverse the hoses to allow flow opposite way as well, then I plug lower inlet to core, and fill with C.L.R, and let it sit overnight if I have time, just to clean out as much calcium clogged up in there as I can. Saved me replacing 2 or 3 heater cores so far, that had little or no heat at idle, prior to cleaning, but had good heat after.

Sounds like you have air trapped in the heater core when you flushed the heater core. loosen the upper most heater core hose and run the engine untill coolant seeps out. Wait until the coolant has reached running temperature.

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Sounds like there is still air pockets in the coolant system, let idle to full temp with the cap off and the car on an upword angle to alow air to move then while engine running and coolant if needed to hot mark on the coolant tank.

yes if its not full of coolant it wont blow heat... let it cool down, fill it with coolant, start the vehicle with your defroster on, all the way over to hot, and on high, watch the level of the coolant, when the thermostat opens, the coolant will be sucked out of the radiator, top it off, after a few minutes you will feel heat.

Make sure the heater control is not on defrost and the the vent is not open. When you put it in defrost there is a vent that opens allowing air to come from outside, from the engine compartment. You should have the control to reserlculate, vent closed. I think that's what you mean, right? Your getting heat inside the car while driving, continuously? If the controls are in the right setting then you have a problem from the switch to the vent. If what you mean is that your car engine is overheating, then the car does not have enough coolant. There is air inside the cooling system, not enough fluid to cool the vehicle. If you're sure this is not the problem then change the coolant sensor. Adding or replacing coolant to a radiator is more tricky then people make it seem. When you replaced the thermostat coolant should have been added properly and you should have no problems. Unless you installed the thermostat backwards.